Negotiation Skills: preparing and making deals

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I'm learning "Negotiation Skills: preparing and making deals" on The Future Market. Lesson 1: "A full preparation sheet".

What the lesson teaches:
- Before this course: Negotiation Basics (course 2.14). You already know BATNA, walk-away point, target, ZOPA, anchoring and the "if... then" trade. This course puts them into one preparation sheet and a real negotiation.
- Harvard's Program on Negotiation (PON) publishes a preparation checklist of 32 questions grouped around your own position, the other side's position, and the process.
- Your side: your goals, strengths and weaknesses, your BATNA, your reservation point (your walk-away) and your aspiration point (your target).
- Their side: their interests, their likely reservation point and BATNA, and whether a zone of possible agreement (ZOPA) exists.
- Process: who decides, who else is involved, and whether you can discuss several issues at the same time.
- A sheet is a guess. Update it when you learn new facts.

The exercise I'm working on:
Fill in a Me, Them, Process sheet for a real or practice negotiation. Mark your guesses.

I'm stuck. Please:
1. Explain the main idea in plain, simple words with one everyday example.
2. Walk me through the exercise one small step at a time. Ask me what I've done so far before giving the next step.
3. Don't just give me the final answer. Help me do it myself, and check my work when I share it.

I'm a parent helping my child (about 8 years old) with a lesson called "A full preparation sheet" from the course "Negotiation Skills: preparing and making deals".

Here's what the lesson says:
Before a game, a coach writes a plan: what we want, what we will not accept, and what the other team might do. A negotiation also needs a plan on paper.

The activity:
Fill in a Me, Them, Process sheet for a real or practice negotiation. Mark your guesses.

Please explain this so an 8-year-old understands: short sentences, a fun everyday example, and no hard words.
Then give me 3 simple questions I can ask my child to check they understood, and a way to do the activity together, one tiny step at a time.